Feeding device for rock drills



May 19, 1931. c. c. HANSEN FEEDING DEVICE FOR ROCK 'DRILLS Filed Ot. 19, 1928 n 4 2 i m c z P, @TV fair w F0 k JQwwZw. y a m f/ 6 a 1S JM d m V & M ,a 2.@ i Z? f, A/A J A e s l AF t F fw R @E P a ff ed, a n llfL a m/ u j R 0J l Y the rebound of the the hammerpistcn Patented May .-19, V1931 Y CHARLESv c. HANSEN, .or EASTON, PENNsYnvANi,1

Y COMPANY; OFJERSEY crrnfnnwimnsnn'aconronarroir ornnwunasnv 'v FEEnInG nnvrcn Application mea october 19, i928. sria'1'ito.*a13',52s.

VThis invention relates to rockdrillsof the liuid actuated typeybut more particularly to a feeding device which forms a-'sup'p'ortfor the rockA drill and is intended to advancethe ydrilling mechanism towards the work'in accordance withthepenetration of the working implement intothe material being drilled.

One objectlofthe invention is'r to prevent the work due to the reciprocatory actionof of'the'drill. "Anotherobject is tofenable the feeding device to be readily controlledpbothfor ap-v plying' the pressure to from the work.--

other Obli-,eaV will, bef apart @message in part pointed out'hereinaitzer.A i In 'the' drawings illustrating afipnactical' embodiment'of the "inventiomy and in which similar' reference characters :refer kto similar i by the arrows. Y f v v Referring more particularly tothe drawt ings, A

t head D. 35

' Figure l is a :side elevation of a rockdrill equipped with a with the practice of the `invention,xand

Figure 2-'is a sectional-'elevation ofthe feeding device taken through Eigure l on the line 2-2lo`okinginV the direction indicated generally Vdesignates ja rockV drill fof the stoper type having a' percussive element B which `comprisesa cylinder Gand a 'front The front'headDservesas a guide for a drill steel Elend is secured tothe cylin'-y der C by means 'of spring. pressedside'bolts-F.l

. Connected Ato the rearward end vof the V4cy,-

inderfC is a head bloclrG to whichis attached in this instance a handle ,H *having a grip portion J` adapted to be graspediby the operator forloscillating the" drill during its Vopera-k tion and thus-V constantly changingthe'r position of the 4drilly steeliEin -the` ;hole*being li drilled. l i, s The pressure'medium,` such as compressed air or. steam;A maybe convyed'to the. rocky drill througha connectionV leading from a source .of pressure fluid supply.I The connectionK is connectedto the head block "G adjacent the throttle valve,` only thefhandle drilling mechanism 'freni the drilling mechanlsm and to retract'f'such drilling mechanism: Y

feeding device'in accordance Fondindcx inaILIisy VL fWhich sfshown,` andfwhereby the admlssionofy pressure iuidinto the drill may -be controlled.` t t t In'accordance withy the'practice ofthe in.-

vention meansare provided `for, constantly t advancing the rock drill in accordance .with the-penetration of thedrill'steel into theV material lbeing drilledso that the portionv of A the drillk steelk aga-inst` which ythe blows lare being delivered will beconstantly within the range fof `travel 1 of `thev hammer piston .(not shown) but forfwhich4 the cylinder: C forms f a housing. f. These means in the 'present instance comprise a piston O Vwhich-"extendsslidably into a feeding cylinder P; :The piston O has a head Q which is seated on'the head block "G and is secured thereto by means vor" bolts R'which may also serveto secure the head yblock Gto the cylinderQi i 1 Th flowermost yor free', end of the piston() is in the 'form of' a head S havinga series of 'grboves T for the` accommodation of sealing means, such age of the pressure ymedium between the head Softhe'piston and the cylinder P. fThe head A of `any suitable length tofassnre accurate 'alignment between ,the

S of the piston ymay-be pist-on andthe cylinderpy *Thestemor rod\V of the piston O is of-"course of smaller diam-l eter than the heady S thus 'W whichmay'abut an internal `liange or shoulder X in the upper end vof the 'cylinder P yo prevent separation ofthev piston and the cylinder. -W I The ange X is 'preferably located a slight distance from the endfof the cylinder Pso thatit may'actvas a disposed in a recess `der The wearing'ring Y'mayV be conveni'orming ak shoulder iently securedin the recess Z by means of an seat fora `wearing ring Y Y Z intheend .of the cylinas piston rings U to prevent leak-y internally -threaded'collarc threaded on .the

end -ofthe cylinder P and having ka' lateral angel d to bear against theend of thering Y. In drills of the typevto which the `present invention pertains it isfthe practice 'to intro'- duce a pressure iuidsuchas compressed air or steam into` f the feeding( cylinder to act against the piston Oifor constantly maintaining the percussive element within-striking rangefof the drill steelltr i f v fluid.

hammer piston strikes against the drill steely a considerable amount of the force of the blow of thek hammer piston is utilized for `carrying the drill steel into contact with thematerial being drilled. Whereas, the ideal condition istomantaim the cutting end o the drill steel il mbstxlltially constant contact with the r In order therefore to insure against such midcsirahle retraction of the drilling mechanism from the roclr, means are` provided for introducing an incoinpressible'fluid,l such as water' e into the. feeding cylinder? to advance the iston O and thus also the rock drill A. To llris end the feeding cylinder P is prf vided with a reservoir f forwater e'. The reservoir f may, as illustrated, encircle the cylinder O and is provided with a lhead g which seals one end o thel reservoir f and has n annular flange kl. which extends into the end of the reservoir f and serves to centralize nid reservoir with respect to the cylinder P. A closure is provided for the opposite end of the reservoir f, and in this instance also far the corresponding end kof the feeding cylinder a head j having an annular ve k in its end and into which extend the ank of the cylinder P and the reservoir f. The head j also acts as a foot piece to which may be secured the pointer o which engages anelcrnmt such as the floor of a mine, or, as shown a plank. p,to support the drill and also to anreagainst misalignment of the drilling mechanism with respect to the hole being The head j in this instance is provided with a valve chamber gf for the reception of a throttle valve frhaving a stem s which extends to the exterior of the head j and to Which-is mcured a throttle handle t. The throttle hmdk t preferably is ot' the multi-lever type an that it may be Vengaged at either side of the Item a for manipulating the throttle valve r. Thcwings u of the handle t are preferably of such length that they may be readily engaged by the foot oi the operator for actuating the throttle valve. Lugsfv `which may form an integrll part of the head j act as stops for the win u of the throttle handle.

The throttle valve r is preferably' of less length than the chamber q wherein it is disposed and has a central cha ber @c which is C lea gfromt relative-v vthe head y and through which t y cylinder P.

in constant communication with the reservoir fthrough a passage m in the head j. In addition to the central chamber w the throttle valve is also provided with a pair of ports y and a. The port y acts as an inlet port and is ada ed to re ister with an inlet passage 2 e valve chamber g tothe cylinderP, and the port z serves as an exhaust port which in one limiting position of the throttle valve r registers with an exhaust assage 3 in liquid or water c ma flow from the cylinder P into the throttle va 1e and thence into the reservoir as will be presently described.

The parts y and Le are of course so located of them may be positioned to chamber w of the throttle valve into communication with the cylinder P at one time. ln'thm way when liquid is being introduced into the cylinder there can be no eduction of liquid from the cylinder. Similarly while liquid is being exhausted from the cylinder vP the inletport y will occupy a position wherein it will be out of registry wi the inlet passage 2. c

In order to insure against thev forcing of liquid from the cylinder P during the time that itis desired to exert a constant and incompressible pressure against the feeding piston O, the inlet passage 2 is provided with a check valve in the form of a ball i seated on a valve seat 5 in the passage 2 to form a seal at this point. VPreferably a spring 6 is also disposed in the 2 to constantly tend topre the ball 4 to its seat, and' a yseat Z threaded into the end of the passage 2 serves as a seat for one end of the spring and has a port 8 through which liquid may flow into the ccding cylinder P.

The reservoir i mav be of a volume capable od accommodating a supply o liquid or water c somcwhat in excess o the volume of the feeding cylinder P so that the piston O may be entirely extended in the cylinder P by the liquid without causing the introduction of a portion of the pressure fluid into the feeding The pressure iluid utilized for thus transg the. water from the reservoir into the cynder P may be obtained from the same source as that utilized for actuating the rock drill and in arder to introduce such pressure into the reservoir f the said reservoir is provided with a control valve 9 connected in this instance to the head g. The control valve 9' is preferably of the two-Way type and comprises, a casing 10 to which is connected a conduit 1l.k for conveying prcmure fluid to the reservoir. In the casing 10 is a plurir valve 12 having a recess 13 adapted to register with the connection 11 and a connection l leadin to the reservoir for admitting pressure ui into the reservoir and also to establish conmunication between the connection 14 and n exhaust port 15 inthe casing 10 for exhauplug valve is preferably lof the rotatable type and is accordingly pro-L atmosphere. The

videdwith a lever 16 whereby itjmay be manipulated. i y. -r 4 The operation of the device is asv follows After thedrilling mechanism hasbeen placed," y i y material intended to be drilled, means interl in substantially the correct drilling position the valve 12 may be opened to establish communication betweenthe conduit 11 andthe 1 connection 14 and pressure'lluid will then flow through these channels into the reservoir f to create a pressure on the water e.

After rocking the throttle valve r intoa position in which the inlet port y registers with the inlet passage 2 the-water e4 ork its equuivalent will flow from the chamber 'win the throttle valve through the port z/ and the inlet passage 2past the vball 4 vand into the cylinder P to act against the pistonnO fork forcing the drill steel E against the material intended tolbe drilled.' The water e' will eX- ert an adequate pressure againstthe piston O to hold the drill steelfirmly against the work and maintain the entire drilling mechanism in a position to insure themost efficient drilling. The percussive element may then be set in operation and as the -drillsteel penetrates the rock, water will bevconstantly forced into*l the cylinder P to actuate the piston Oand'the drill toward the work. The water is entrapped in the feeding cylinder Pby the check valve or ball 4 in the inlet passage 2 and owing to its incompressible nature will form a substantially rigid abutment for'the` piston O. The drilling mechanism will therefore i be held against retrograde movement duringV its operation and its correctposition with re-p spect to the drilly steel willbe assured.

Whenever Vit is desiredto retract the drill-* ing mechanism7 the valve-l2jmay be rocked to establish communication between'the ,connection 14 and the exhaust port 15 in thel casingA 10 for exhausting the pressure Huid from they reservoir i and at the ysame time-to cutoff communication between the Vconduit 11 and Thereafter the throttle valve r may be manipulated to carry the portz into j registry with the exhaust passage 3. The water will then be forced from the cylinder P- the reservoir.

by the pressure of the weight of the drillfand will be returned through the throttle valve andr its chamber and through lthe passage )fr to the reservoir f wherein it may remain'until required for a succeeding drilling operation.;rk

VFrom the foregoing description the advan-k tages of this inventionA will be kreadilyap-A i parent to those skilled in the art'to which itz appertains and l wish it to be understoodthat;

While l have shown only lone-specific embodiment thereof the inventionissusceptible of further modification without departing from its spirit Vor from the scopejof theclaims.`

I claim:

n 1. A feeding device for rock drills, `com-V ling the `flow of liquid -erable' means for 'one ofrwhichis ,adaptedto be connected to .the rock drill, areservoir foi` liquid,'means fori-introducing a pressure medium intoj ,the l reservoir toforce -liquid-therefrom 4into one Y. ofy thefm'embers'to; actuate means. f

prisinga feeding cylinder, a piston in the feeding ycylinder and connected to the rock drill, af reservoir Von the cylinder for liquid, passages inthe cylinder affording communication between the reservoir andthe Acylin-KV der, means 5in one ofthe passages for automatically controlling the iow of liquid from the reservoir into the cylinder, manually op` y selectively controlling the ioW of liquid throughk another passage from the cylinder `into the reservoir, and means for introducing a pressure medium into the reservoir to force liquid therefrom into the cylinder for actuating the piston and the rock drillinthe direction of the material intended to ybe drilled. l t

3. A; feeding device for rock drills, `comprising'a feeding cylinder, aV piston in vthey feedingcylinder and connected to the drill, a reservoir for liquid encircling the cylinder,

kpassages affording communication between theiilow o f liquid vfrom the cylinder to the reservoir, and a valve for introducing a pressure mediumitno the reservoir to force liquid v therefrom into kthe cylinder to actuate theV .,110

piston'and the drill inthe direction of the material-intended to be drilled and for exa'p f relatillfmvable members,

2. A feedng device for rock drills, Com v80.

hausting suchkrpressurefmedium fromV the l reservoir n preparatory to vthe withdrawal of the drillfrom the work.

` 4. A feeding device for roel; drills, comprising afeedingcylinder, a piston in the feeding cylinder and connected to the drill, a reservoir for liquid encircling the cylinder, a head forming a closure for the cylinder and the reservoir and having a valve chamber, a passage in they head affording communication vbetween thereservoir and the valve chamber,

` inlet and exhaust passages in the head leading lfrom thevalve chamber to the reservoir, a 'check'valve controlling the inlet passage, Y allthrottle/valve,in` the, valve chamber controlling the 4exhaust passage, and a valve for introducing a pressure mediuminto the reservoir to force liquid therefrom into the cyl- V13o l n :man:

ner to me the pistn and the dril' in the dntom of the material intendedtol be drilled m for exhausting such pressure medium from the servoir -prepu'aiory to the withdrawal of the drill from the work.

In testimony whereof I have signed this L j CHARLES. C. HANSEN.V l 

